US 6,272,441 B1Granted

Method for determining the pulse response of a broad band linear system and a measuring circuit for carrying out the method

OwnerPeter Peyerl, Jürgen Sachsinventors

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Abstract

The invention relates to a method for the determination of the impulse response g(t) of a broad band linear system. The method can be used for the application of high frequency technology. For a test signal, a maximum length binary sequence (MLBS) is employed. The measured signal, obtained by the system, is sampled under maintenance of the sample theorem whereby the sampling clock in accordance with the invention is obtained directly from that high frequency clock pulse which is used for the generation of the MLBS. The digitized measured signal is then subjected to a fast Hadamard-transformation for calculation of the impulse response. The invention furthermore, provides a measuring circuit which carries out this method.

Claims17

Dependent claims

A method for the determination of the impulse response g(t) of a broad band linear system which comprises the steps of:

a) producing a high frequency clock pulse with a frequency of fc≧100 MHz;
b) producing a periodic MLBS m(t) of the order m, and a period length of 2m−1 pulses of the high frequency clock pulse;
c) amplificating and coupling the periodic MLBS m(t) as test signal x(t) to the broad band linear system;
d) receiving and amplifying the response signal of said broad band linear system as a measured signal y(t) to adapt it in its amplitude to the next following units;
e) providing a sampling clock pulse by dividing the high frequency clock rate by the factor of 2n;
f) sampling the analog measured signal over at least 2n periods, and providing sampled analog values, whereby the sample time points are predetermined through the sample pulse and during each period 2m−½n sampled data are gathered;
g) converting said analog sampling values into digital sampled values;
and,
h) determining the impulse response g(t) through calculation of the cross-correlation ψ between the test signal and said digital measured signal under carrying out of a fast Hadamard-transformation (FHT) by determining the order of said digital sampled values.

6 more elements

A measuring circuit for determining the impulse response g(t) of a broad band linear system (11) comprising:

a) a pulse generator (2) for providing a high frequency clock pulse fc;
b) an RF unit (1) comprising:
i) a MLBS generator (4) coupled to said high frequency clock pulse fc, for providing a MLBS signal m(t) of the order m;
ii) an output amplifier (8) for receiving said MLBS m(t) and passing it to a broad band linear system (11);
iii) a controllable input amplifier (13) for receiving and amplifying a response signal from said broad band linear system (11) as a measured signal y(t) for adapting this signal to the next following circuit units;
iv) a digital clock pulse divider (18) for dividing the high frequency clock pulse fc in a predetermined ratio 2n, and for providing a sampling clock pulse, at its output, and
v) a sampling circuit (17) which is controlled by said sampling clock, and samples the received measured signal y(t) from said input amplifier (13),
c) an analog-digital converter (19) for receiving analog sampled values from said sampling circuit (17) and converting these into digital sample values;
d) a calculating unit (20, 21, 22) which combines said individual digital sampled values into a digital measured signal and calculates the impulse response by application of a fast Hadamard-transformation;
and
e) an interface unit (23) for coupling said impulse response to the next following indicator and storage and data processing units.

8 more elements

Dependencies are inferred from the claim text.